Variadic functions, libffi and CType

Hi,
   On one of the ARM ABIs (hard float/VFP) variadic functions are
called with a different ABI;
my suspicion is that there are other architectures on which libffi's
variadic calling doesn't work.

I've got a modification that I'll shortly be contributing to libffi to
provide a ffi_prep_cif_var to
be used with variadic functions where the number of fixed parameters
is passed separately
from the total number of parameters, and you use ffi_prep_cif_var for
variadics but use
fii_prep_cif in the normal way for non-variadics.  For other
architectures ffi_prep_cif_var
just does the same as ffi_prep_cif, so the caller doesn't need to care
about whether this
architecture is special.

I'm not a Python user myself, but I noticed that CType uses libffi and
the examples include
calls to variadic functions, so I wondered what CType people thought
of that change and if it
would be possible to use it with Python.

All thoughts welcome (including others I should ask).

Dave

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